US1758777A - Condenser microphone - Google Patents

Condenser microphone Download PDF

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Publication number
US1758777A
US1758777A US286107A US28610728A US1758777A US 1758777 A US1758777 A US 1758777A US 286107 A US286107 A US 286107A US 28610728 A US28610728 A US 28610728A US 1758777 A US1758777 A US 1758777A
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US
United States
Prior art keywords
diaphragm
condenser microphone
condenser
accordance
dielectric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US286107A
Other languages
English (en)
Inventor
Frederick C Barton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE361603D priority Critical patent/BE361603A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US286107A priority patent/US1758777A/en
Priority to GB27493/28A priority patent/GB313870A/en
Priority to FR679150D priority patent/FR679150A/fr
Application granted granted Critical
Publication of US1758777A publication Critical patent/US1758777A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/04—Microphones

Definitions

  • aan@ ay is, 193e ATENT OFFICE FREDERICK C. BARTON, 0F SCH'ENECTADY, NEW YORK, ASSIGNOR TO GENERAL- ELEC- TRIC COMPANY, A CORPORATION OF YORK CONDENSER MICROPHONE Application filed .Tune 18,
  • My invention relates to condenser microphones capable of having their capacity varied in accordance with sound vibrations, and has for its principal object an improved construction whereby the capacity of such condensers is maintained substantially independent of atmospheric conditions.
  • Microphones of the'electrostatic type are preferably provided with a metal diaphragm constituting one plate of the condenser and adapted kto vibrate in accordance with sound vibrations impinging thereon.
  • This diaphragm is properly stretched and supported so that it is insulated and separated from a second rigid plate by an enclosed space containinga dielectric which is preferably air.
  • a dielectric which is preferably air.
  • a chamber partly enclosed by a yielding member such as a rubber diaphragm is interconnected with the dielectric chamber between the condenser plates.
  • This arrangement permits maintaining the pressure of the dielectric therein in accordance with atmospheric pressure exerted upon the yielding member so that the atmospheric and dielectric pressures on the two sides of the metallic diaphragm respectively, are substantially equal.
  • FIG. 1 illustrates a front view of a condenser microphone constructed in accordance with my invention
  • Fig. 2 is a sectional view thereof looking in the direction of arrow A
  • Fig. 3 is an enlarged section of Fig. 2
  • Fig. 4 is an exploded view of Fig. 3.
  • 10 is a metal diaphragm, preferably of a light ⁇ metal alloy, which is clamped between two collars 11 and 12, the adjoining surfaces 13 and 14 of which are provided with a plurality of successive sinusoidal grooves and ridges. It is important, for'the proper operation of 192s. serial No. 286,197.
  • the diaphragm that :it be uniformly clamped with substantially no deformation.
  • the sinusoidal grooves and ridges provide a maximum of clamping surface with thc least possible deformation and with the use of paper washers 15 and 16 an additional protection of the clamped surfaces is obtained.
  • the diaphragm is stretched by forcing ring 17 against its surface with the aid of threaded ring 25.
  • a washer 2l is placed inside the collar 11 and a member 20, having its surface inline with the surface of electrode 19, is rmly held against it by suitable clamping means.
  • the electrode 19 is, therefore, spaced from the diaphragm by a distance determined by the thickness of outer surface exposed to the atmosphere seals the dielectric from the surrounding air but allows it to expand and contract in accordance with temperature changes and maintains it under a pressure substantially equal to that of the surrounding atmosphere.
  • the electrodes are connected to a suitable source of energy by ⁇ y conductors attached to screws 26 and 27 respectively'.
  • the microphone In the operation of the microphone, a suitable difference of electric potential is maintained between the electrodes and when sound waves vibrate the diaphragm the spacing between the electrodes, and consequently the capacity, varies iny accordance with these vibrations.
  • the capacity variations, or impulses, are impressed upon suitable amplifying. and transmitting apparatus and may be eventually reconverted into sound.
  • a diaphragm means for clamping said diaphragm e l including clamping surfaces comprising a plurality of successive sinusoidal grooves and ridges arranged to overlapthe edge of said diaphragm, non-metallic rings'interposed between said diaphragm and said surfaces and 1o means arranged to force said surfaces toward each other.
  • a condenser microphone a diap phragm, means for clampingfsaiddiaphragm yincluding a pair of rings provided( with 15 clamping surfaces comprising a plurality of successive sinusoidal grooves and ridges arranged parallel to each other, insulating rings interposed between said diaphragm and said surfaces, means arranged to force said sur- 20 faces toward leach other, and a movable member arranged Within one of said rings to be forcedL against said diaphragm.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
US286107A 1928-06-18 1928-06-18 Condenser microphone Expired - Lifetime US1758777A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE361603D BE361603A (xx) 1928-06-18
US286107A US1758777A (en) 1928-06-18 1928-06-18 Condenser microphone
GB27493/28A GB313870A (en) 1928-06-18 1928-09-25 Improvements in condenser microphones
FR679150D FR679150A (fr) 1928-06-18 1929-06-18 Perfectionnements apportés aux microphones électrostatiques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US286107A US1758777A (en) 1928-06-18 1928-06-18 Condenser microphone

Publications (1)

Publication Number Publication Date
US1758777A true US1758777A (en) 1930-05-13

Family

ID=23097106

Family Applications (1)

Application Number Title Priority Date Filing Date
US286107A Expired - Lifetime US1758777A (en) 1928-06-18 1928-06-18 Condenser microphone

Country Status (4)

Country Link
US (1) US1758777A (xx)
BE (1) BE361603A (xx)
FR (1) FR679150A (xx)
GB (1) GB313870A (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984001683A1 (en) * 1982-10-08 1984-04-26 Niels Martin Jensen Diaphragm stretching apparatus
US7514626B1 (en) 2007-12-14 2009-04-07 John Jerome Snyder Method and apparatus for electrostatic pickup for stringed musical instruments

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984001683A1 (en) * 1982-10-08 1984-04-26 Niels Martin Jensen Diaphragm stretching apparatus
US7514626B1 (en) 2007-12-14 2009-04-07 John Jerome Snyder Method and apparatus for electrostatic pickup for stringed musical instruments

Also Published As

Publication number Publication date
BE361603A (xx)
GB313870A (en) 1929-09-26
FR679150A (fr) 1930-04-09

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